arch/x86/Kconfig.cpu - third_party/linux - Git at Google


            
            # SPDX-License-Identifier: GPL-2.0

            
            # Put here option for CPU selection and depending optimization

            
            choice

            
            	prompt "Processor family"

            
            	default M686 if X86_32

            
            	default GENERIC_CPU if X86_64

            
            	---help---

            
            	  This is the processor type of your CPU. This information is

            
            	  used for optimizing purposes. In order to compile a kernel

            
            	  that can run on all supported x86 CPU types (albeit not

            
            	  optimally fast), you can specify "486" here.


            	  Note that the 386 is no longer supported, this includes

            
            	  AMD/Cyrix/Intel 386DX/DXL/SL/SLC/SX, Cyrix/TI 486DLC/DLC2,

            
            	  UMC 486SX-S and the NexGen Nx586.


            	  The kernel will not necessarily run on earlier architectures than

            
            	  the one you have chosen, e.g. a Pentium optimized kernel will run on

            
            	  a PPro, but not necessarily on a i486.


            	  Here are the settings recommended for greatest speed:

            
            	  - "486" for the AMD/Cyrix/IBM/Intel 486DX/DX2/DX4 or

            
            	    SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or U5S.

            
            	  - "586" for generic Pentium CPUs lacking the TSC

            
            	    (time stamp counter) register.

            
            	  - "Pentium-Classic" for the Intel Pentium.

            
            	  - "Pentium-MMX" for the Intel Pentium MMX.

            
            	  - "Pentium-Pro" for the Intel Pentium Pro.

            
            	  - "Pentium-II" for the Intel Pentium II or pre-Coppermine Celeron.

            
            	  - "Pentium-III" for the Intel Pentium III or Coppermine Celeron.

            
            	  - "Pentium-4" for the Intel Pentium 4 or P4-based Celeron.

            
            	  - "K6" for the AMD K6, K6-II and K6-III (aka K6-3D).

            
            	  - "Athlon" for the AMD K7 family (Athlon/Duron/Thunderbird).

            
            	  - "Opteron/Athlon64/Hammer/K8" for all K8 and newer AMD CPUs.

            
            	  - "Crusoe" for the Transmeta Crusoe series.

            
            	  - "Efficeon" for the Transmeta Efficeon series.

            
            	  - "Winchip-C6" for original IDT Winchip.

            
            	  - "Winchip-2" for IDT Winchips with 3dNow! capabilities.

            
            	  - "AMD Elan" for the 32-bit AMD Elan embedded CPU.

            
            	  - "GeodeGX1" for Geode GX1 (Cyrix MediaGX).

            
            	  - "Geode GX/LX" For AMD Geode GX and LX processors.

            
            	  - "CyrixIII/VIA C3" for VIA Cyrix III or VIA C3.

            
            	  - "VIA C3-2" for VIA C3-2 "Nehemiah" (model 9 and above).

            
            	  - "VIA C7" for VIA C7.

            
            	  - "Intel P4" for the Pentium 4/Netburst microarchitecture.

            
            	  - "Core 2/newer Xeon" for all core2 and newer Intel CPUs.

            
            	  - "Intel Atom" for the Atom-microarchitecture CPUs.

            
            	  - "Generic-x86-64" for a kernel which runs on any x86-64 CPU.


            	  See each option's help text for additional details. If you don't know

            
            	  what to do, choose "486".


            config M486

            
            	bool "486"

            
            	depends on X86_32

            
            	---help---

            
            	  Select this for an 486-class CPU such as AMD/Cyrix/IBM/Intel

            
            	  486DX/DX2/DX4 or SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or U5S.


            config M586

            
            	bool "586/K5/5x86/6x86/6x86MX"

            
            	depends on X86_32

            
            	---help---

            
            	  Select this for an 586 or 686 series processor such as the AMD K5,

            
            	  the Cyrix 5x86, 6x86 and 6x86MX.  This choice does not

            
            	  assume the RDTSC (Read Time Stamp Counter) instruction.


            config M586TSC

            
            	bool "Pentium-Classic"

            
            	depends on X86_32

            
            	---help---

            
            	  Select this for a Pentium Classic processor with the RDTSC (Read

            
            	  Time Stamp Counter) instruction for benchmarking.


            config M586MMX

            
            	bool "Pentium-MMX"

            
            	depends on X86_32

            
            	---help---

            
            	  Select this for a Pentium with the MMX graphics/multimedia

            
            	  extended instructions.


            config M686

            
            	bool "Pentium-Pro"

            
            	depends on X86_32

            
            	---help---

            
            	  Select this for Intel Pentium Pro chips.  This enables the use of

            
            	  Pentium Pro extended instructions, and disables the init-time guard

            
            	  against the f00f bug found in earlier Pentiums.


            config MPENTIUMII

            
            	bool "Pentium-II/Celeron(pre-Coppermine)"

            
            	depends on X86_32

            
            	---help---

            
            	  Select this for Intel chips based on the Pentium-II and

            
            	  pre-Coppermine Celeron core.  This option enables an unaligned

            
            	  copy optimization, compiles the kernel with optimization flags

            
            	  tailored for the chip, and applies any applicable Pentium Pro

            
            	  optimizations.


            config MPENTIUMIII

            
            	bool "Pentium-III/Celeron(Coppermine)/Pentium-III Xeon"

            
            	depends on X86_32

            
            	---help---

            
            	  Select this for Intel chips based on the Pentium-III and

            
            	  Celeron-Coppermine core.  This option enables use of some

            
            	  extended prefetch instructions in addition to the Pentium II

            
            	  extensions.


            config MPENTIUMM

            
            	bool "Pentium M"

            
            	depends on X86_32

            
            	---help---

            
            	  Select this for Intel Pentium M (not Pentium-4 M)

            
            	  notebook chips.


            config MPENTIUM4

            
            	bool "Pentium-4/Celeron(P4-based)/Pentium-4 M/older Xeon"

            
            	depends on X86_32

            
            	---help---

            
            	  Select this for Intel Pentium 4 chips.  This includes the

            
            	  Pentium 4, Pentium D, P4-based Celeron and Xeon, and

            
            	  Pentium-4 M (not Pentium M) chips.  This option enables compile

            
            	  flags optimized for the chip, uses the correct cache line size, and

            
            	  applies any applicable optimizations.


            	  CPUIDs: F[0-6][1-A] (in /proc/cpuinfo show = cpu family : 15 )


            	  Select this for:

            
            	    Pentiums (Pentium 4, Pentium D, Celeron, Celeron D) corename:

            
            		-Willamette

            
            		-Northwood

            
            		-Mobile Pentium 4

            
            		-Mobile Pentium 4 M

            
            		-Extreme Edition (Gallatin)

            
            		-Prescott

            
            		-Prescott 2M

            
            		-Cedar Mill

            
            		-Presler

            
            		-Smithfiled

            
            	    Xeons (Intel Xeon, Xeon MP, Xeon LV, Xeon MV) corename:

            
            		-Foster

            
            		-Prestonia

            
            		-Gallatin

            
            		-Nocona

            
            		-Irwindale

            
            		-Cranford

            
            		-Potomac

            
            		-Paxville

            
            		-Dempsey


            config MK6

            
            	bool "K6/K6-II/K6-III"

            
            	depends on X86_32

            
            	---help---

            
            	  Select this for an AMD K6-family processor.  Enables use of

            
            	  some extended instructions, and passes appropriate optimization

            
            	  flags to GCC.


            config MK7

            
            	bool "Athlon/Duron/K7"

            
            	depends on X86_32

            
            	---help---

            
            	  Select this for an AMD Athlon K7-family processor.  Enables use of

            
            	  some extended instructions, and passes appropriate optimization

            
            	  flags to GCC.


            config MK8

            
            	bool "Opteron/Athlon64/Hammer/K8"

            
            	---help---

            
            	  Select this for an AMD Opteron or Athlon64 Hammer-family processor.

            
            	  Enables use of some extended instructions, and passes appropriate

            
            	  optimization flags to GCC.


            config MCRUSOE

            
            	bool "Crusoe"

            
            	depends on X86_32

            
            	---help---

            
            	  Select this for a Transmeta Crusoe processor.  Treats the processor

            
            	  like a 586 with TSC, and sets some GCC optimization flags (like a

            
            	  Pentium Pro with no alignment requirements).


            config MEFFICEON

            
            	bool "Efficeon"

            
            	depends on X86_32

            
            	---help---

            
            	  Select this for a Transmeta Efficeon processor.


            config MWINCHIPC6

            
            	bool "Winchip-C6"

            
            	depends on X86_32

            
            	---help---

            
            	  Select this for an IDT Winchip C6 chip.  Linux and GCC

            
            	  treat this chip as a 586TSC with some extended instructions

            
            	  and alignment requirements.


            config MWINCHIP3D

            
            	bool "Winchip-2/Winchip-2A/Winchip-3"

            
            	depends on X86_32

            
            	---help---

            
            	  Select this for an IDT Winchip-2, 2A or 3.  Linux and GCC

            
            	  treat this chip as a 586TSC with some extended instructions

            
            	  and alignment requirements.  Also enable out of order memory

            
            	  stores for this CPU, which can increase performance of some

            
            	  operations.


            config MELAN

            
            	bool "AMD Elan"

            
            	depends on X86_32

            
            	---help---

            
            	  Select this for an AMD Elan processor.


            	  Do not use this option for K6/Athlon/Opteron processors!


            config MGEODEGX1

            
            	bool "GeodeGX1"

            
            	depends on X86_32

            
            	---help---

            
            	  Select this for a Geode GX1 (Cyrix MediaGX) chip.


            config MGEODE_LX

            
            	bool "Geode GX/LX"

            
            	depends on X86_32

            
            	---help---

            
            	  Select this for AMD Geode GX and LX processors.


            config MCYRIXIII

            
            	bool "CyrixIII/VIA-C3"

            
            	depends on X86_32

            
            	---help---

            
            	  Select this for a Cyrix III or C3 chip.  Presently Linux and GCC

            
            	  treat this chip as a generic 586. Whilst the CPU is 686 class,

            
            	  it lacks the cmov extension which gcc assumes is present when

            
            	  generating 686 code.

            
            	  Note that Nehemiah (Model 9) and above will not boot with this

            
            	  kernel due to them lacking the 3DNow! instructions used in earlier

            
            	  incarnations of the CPU.


            config MVIAC3_2

            
            	bool "VIA C3-2 (Nehemiah)"

            
            	depends on X86_32

            
            	---help---

            
            	  Select this for a VIA C3 "Nehemiah". Selecting this enables usage

            
            	  of SSE and tells gcc to treat the CPU as a 686.

            
            	  Note, this kernel will not boot on older (pre model 9) C3s.


            config MVIAC7

            
            	bool "VIA C7"

            
            	depends on X86_32

            
            	---help---

            
            	  Select this for a VIA C7.  Selecting this uses the correct cache

            
            	  shift and tells gcc to treat the CPU as a 686.


            config MPSC

            
            	bool "Intel P4 / older Netburst based Xeon"

            
            	depends on X86_64

            
            	---help---

            
            	  Optimize for Intel Pentium 4, Pentium D and older Nocona/Dempsey

            
            	  Xeon CPUs with Intel 64bit which is compatible with x86-64.

            
            	  Note that the latest Xeons (Xeon 51xx and 53xx) are not based on the

            
            	  Netburst core and shouldn't use this option. You can distinguish them

            
            	  using the cpu family field

            
            	  in /proc/cpuinfo. Family 15 is an older Xeon, Family 6 a newer one.


            config MCORE2

            
            	bool "Core 2/newer Xeon"

            
            	---help---


            	  Select this for Intel Core 2 and newer Core 2 Xeons (Xeon 51xx and

            
            	  53xx) CPUs. You can distinguish newer from older Xeons by the CPU

            
            	  family in /proc/cpuinfo. Newer ones have 6 and older ones 15

            
            	  (not a typo)


            config MATOM

            
            	bool "Intel Atom"

            
            	---help---


            	  Select this for the Intel Atom platform. Intel Atom CPUs have an

            
            	  in-order pipelining architecture and thus can benefit from

            
            	  accordingly optimized code. Use a recent GCC with specific Atom

            
            	  support in order to fully benefit from selecting this option.


            config GENERIC_CPU

            
            	bool "Generic-x86-64"

            
            	depends on X86_64

            
            	---help---

            
            	  Generic x86-64 CPU.

            
            	  Run equally well on all x86-64 CPUs.


            endchoice


            config X86_GENERIC

            
            	bool "Generic x86 support"

            
            	depends on X86_32

            
            	---help---

            
            	  Instead of just including optimizations for the selected

            
            	  x86 variant (e.g. PII, Crusoe or Athlon), include some more

            
            	  generic optimizations as well. This will make the kernel

            
            	  perform better on x86 CPUs other than that selected.


            	  This is really intended for distributors who need more

            
            	  generic optimizations.


            #

            
            # Define implied options from the CPU selection here

            
            config X86_INTERNODE_CACHE_SHIFT

            
            	int

            
            	default "12" if X86_VSMP

            
            	default X86_L1_CACHE_SHIFT


            config X86_L1_CACHE_SHIFT

            
            	int

            
            	default "7" if MPENTIUM4 || MPSC

            
            	default "6" if MK7 || MK8 || MPENTIUMM || MCORE2 || MATOM || MVIAC7 || X86_GENERIC || GENERIC_CPU

            
            	default "4" if MELAN || M486 || MGEODEGX1

            
            	default "5" if MWINCHIP3D || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX


            config X86_PPRO_FENCE

            
            	bool "PentiumPro memory ordering errata workaround"

            
            	depends on M686 || M586MMX || M586TSC || M586 || M486 || MGEODEGX1

            
            	---help---

            
            	  Old PentiumPro multiprocessor systems had errata that could cause

            
            	  memory operations to violate the x86 ordering standard in rare cases.

            
            	  Enabling this option will attempt to work around some (but not all)

            
            	  occurrences of this problem, at the cost of much heavier spinlock and

            
            	  memory barrier operations.


            	  If unsure, say n here. Even distro kernels should think twice before

            
            	  enabling this: there are few systems, and an unlikely bug.


            config X86_F00F_BUG

            
            	def_bool y

            
            	depends on M586MMX || M586TSC || M586 || M486


            config X86_INVD_BUG

            
            	def_bool y

            
            	depends on M486


            config X86_ALIGNMENT_16

            
            	def_bool y

            
            	depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MELAN || MK6 || M586MMX || M586TSC || M586 || M486 || MVIAC3_2 || MGEODEGX1


            config X86_INTEL_USERCOPY

            
            	def_bool y

            
            	depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK7 || MEFFICEON || MCORE2


            config X86_USE_PPRO_CHECKSUM

            
            	def_bool y

            
            	depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MVIAC7 || MEFFICEON || MGEODE_LX || MCORE2 || MATOM


            config X86_USE_3DNOW

            
            	def_bool y

            
            	depends on (MCYRIXIII || MK7 || MGEODE_LX) && !UML


            #

            
            # P6_NOPs are a relatively minor optimization that require a family >=

            
            # 6 processor, except that it is broken on certain VIA chips.

            
            # Furthermore, AMD chips prefer a totally different sequence of NOPs

            
            # (which work on all CPUs).  In addition, it looks like Virtual PC

            
            # does not understand them.

            
            #

            
            # As a result, disallow these if we're not compiling for X86_64 (these

            
            # NOPs do work on all x86-64 capable chips); the list of processors in

            
            # the right-hand clause are the cores that benefit from this optimization.

            
            #

            
            config X86_P6_NOP

            
            	def_bool y

            
            	depends on X86_64

            
            	depends on (MCORE2 || MPENTIUM4 || MPSC)


            config X86_TSC

            
            	def_bool y

            
            	depends on (MWINCHIP3D || MCRUSOE || MEFFICEON || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || MK8 || MVIAC3_2 || MVIAC7 || MGEODEGX1 || MGEODE_LX || MCORE2 || MATOM) || X86_64


            config X86_CMPXCHG64

            
            	def_bool y

            
            	depends on X86_PAE || X86_64 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MATOM


            # this should be set for all -march=.. options where the compiler

            
            # generates cmov.

            
            config X86_CMOV

            
            	def_bool y

            
            	depends on (MK8 || MK7 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MCRUSOE || MEFFICEON || X86_64 || MATOM || MGEODE_LX)


            config X86_MINIMUM_CPU_FAMILY

            
            	int

            
            	default "64" if X86_64

            
            	default "6" if X86_32 && X86_P6_NOP

            
            	default "5" if X86_32 && X86_CMPXCHG64

            
            	default "4"


            config X86_DEBUGCTLMSR

            
            	def_bool y

            
            	depends on !(MK6 || MWINCHIPC6 || MWINCHIP3D || MCYRIXIII || M586MMX || M586TSC || M586 || M486) && !UML


            menuconfig PROCESSOR_SELECT

            
            	bool "Supported processor vendors" if EXPERT

            
            	---help---

            
            	  This lets you choose what x86 vendor support code your kernel

            
            	  will include.


            config CPU_SUP_INTEL

            
            	default y

            
            	bool "Support Intel processors" if PROCESSOR_SELECT

            
            	---help---

            
            	  This enables detection, tunings and quirks for Intel processors


            	  You need this enabled if you want your kernel to run on an

            
            	  Intel CPU. Disabling this option on other types of CPUs

            
            	  makes the kernel a tiny bit smaller. Disabling it on an Intel

            
            	  CPU might render the kernel unbootable.


            	  If unsure, say N.


            config CPU_SUP_CYRIX_32

            
            	default y

            
            	bool "Support Cyrix processors" if PROCESSOR_SELECT

            
            	depends on M486 || M586 || M586TSC || M586MMX || (EXPERT && !64BIT)

            
            	---help---

            
            	  This enables detection, tunings and quirks for Cyrix processors


            	  You need this enabled if you want your kernel to run on a

            
            	  Cyrix CPU. Disabling this option on other types of CPUs

            
            	  makes the kernel a tiny bit smaller. Disabling it on a Cyrix

            
            	  CPU might render the kernel unbootable.


            	  If unsure, say N.


            config CPU_SUP_AMD

            
            	default y

            
            	bool "Support AMD processors" if PROCESSOR_SELECT

            
            	---help---

            
            	  This enables detection, tunings and quirks for AMD processors


            	  You need this enabled if you want your kernel to run on an

            
            	  AMD CPU. Disabling this option on other types of CPUs

            
            	  makes the kernel a tiny bit smaller. Disabling it on an AMD

            
            	  CPU might render the kernel unbootable.


            	  If unsure, say N.


            config CPU_SUP_CENTAUR

            
            	default y

            
            	bool "Support Centaur processors" if PROCESSOR_SELECT

            
            	---help---

            
            	  This enables detection, tunings and quirks for Centaur processors


            	  You need this enabled if you want your kernel to run on a

            
            	  Centaur CPU. Disabling this option on other types of CPUs

            
            	  makes the kernel a tiny bit smaller. Disabling it on a Centaur

            
            	  CPU might render the kernel unbootable.


            	  If unsure, say N.


            config CPU_SUP_TRANSMETA_32

            
            	default y

            
            	bool "Support Transmeta processors" if PROCESSOR_SELECT

            
            	depends on !64BIT

            
            	---help---

            
            	  This enables detection, tunings and quirks for Transmeta processors


            	  You need this enabled if you want your kernel to run on a

            
            	  Transmeta CPU. Disabling this option on other types of CPUs

            
            	  makes the kernel a tiny bit smaller. Disabling it on a Transmeta

            
            	  CPU might render the kernel unbootable.


            	  If unsure, say N.


            config CPU_SUP_UMC_32

            
            	default y

            
            	bool "Support UMC processors" if PROCESSOR_SELECT

            
            	depends on M486 || (EXPERT && !64BIT)

            
            	---help---

            
            	  This enables detection, tunings and quirks for UMC processors


            	  You need this enabled if you want your kernel to run on a

            
            	  UMC CPU. Disabling this option on other types of CPUs

            
            	  makes the kernel a tiny bit smaller. Disabling it on a UMC

            
            	  CPU might render the kernel unbootable.


            	  If unsure, say N.
	# SPDX-License-Identifier: GPL-2.0
	# Put here option for CPU selection and depending optimization
	choice
	prompt "Processor family"
	default M686 if X86_32
	default GENERIC_CPU if X86_64
	---help---
	This is the processor type of your CPU. This information is
	used for optimizing purposes. In order to compile a kernel
	that can run on all supported x86 CPU types (albeit not
	optimally fast), you can specify "486" here.

	Note that the 386 is no longer supported, this includes
	AMD/Cyrix/Intel 386DX/DXL/SL/SLC/SX, Cyrix/TI 486DLC/DLC2,
	UMC 486SX-S and the NexGen Nx586.

	The kernel will not necessarily run on earlier architectures than
	the one you have chosen, e.g. a Pentium optimized kernel will run on
	a PPro, but not necessarily on a i486.

	Here are the settings recommended for greatest speed:
	- "486" for the AMD/Cyrix/IBM/Intel 486DX/DX2/DX4 or
	SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or U5S.
	- "586" for generic Pentium CPUs lacking the TSC
	(time stamp counter) register.
	- "Pentium-Classic" for the Intel Pentium.
	- "Pentium-MMX" for the Intel Pentium MMX.
	- "Pentium-Pro" for the Intel Pentium Pro.
	- "Pentium-II" for the Intel Pentium II or pre-Coppermine Celeron.
	- "Pentium-III" for the Intel Pentium III or Coppermine Celeron.
	- "Pentium-4" for the Intel Pentium 4 or P4-based Celeron.
	- "K6" for the AMD K6, K6-II and K6-III (aka K6-3D).
	- "Athlon" for the AMD K7 family (Athlon/Duron/Thunderbird).
	- "Opteron/Athlon64/Hammer/K8" for all K8 and newer AMD CPUs.
	- "Crusoe" for the Transmeta Crusoe series.
	- "Efficeon" for the Transmeta Efficeon series.
	- "Winchip-C6" for original IDT Winchip.
	- "Winchip-2" for IDT Winchips with 3dNow! capabilities.
	- "AMD Elan" for the 32-bit AMD Elan embedded CPU.
	- "GeodeGX1" for Geode GX1 (Cyrix MediaGX).
	- "Geode GX/LX" For AMD Geode GX and LX processors.
	- "CyrixIII/VIA C3" for VIA Cyrix III or VIA C3.
	- "VIA C3-2" for VIA C3-2 "Nehemiah" (model 9 and above).
	- "VIA C7" for VIA C7.
	- "Intel P4" for the Pentium 4/Netburst microarchitecture.
	- "Core 2/newer Xeon" for all core2 and newer Intel CPUs.
	- "Intel Atom" for the Atom-microarchitecture CPUs.
	- "Generic-x86-64" for a kernel which runs on any x86-64 CPU.

	See each option's help text for additional details. If you don't know
	what to do, choose "486".

	config M486
	bool "486"
	depends on X86_32
	---help---
	Select this for an 486-class CPU such as AMD/Cyrix/IBM/Intel
	486DX/DX2/DX4 or SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or U5S.

	config M586
	bool "586/K5/5x86/6x86/6x86MX"
	depends on X86_32
	---help---
	Select this for an 586 or 686 series processor such as the AMD K5,
	the Cyrix 5x86, 6x86 and 6x86MX. This choice does not
	assume the RDTSC (Read Time Stamp Counter) instruction.

	config M586TSC
	bool "Pentium-Classic"
	depends on X86_32
	---help---
	Select this for a Pentium Classic processor with the RDTSC (Read
	Time Stamp Counter) instruction for benchmarking.

	config M586MMX
	bool "Pentium-MMX"
	depends on X86_32
	---help---
	Select this for a Pentium with the MMX graphics/multimedia
	extended instructions.

	config M686
	bool "Pentium-Pro"
	depends on X86_32
	---help---
	Select this for Intel Pentium Pro chips. This enables the use of
	Pentium Pro extended instructions, and disables the init-time guard
	against the f00f bug found in earlier Pentiums.

	config MPENTIUMII
	bool "Pentium-II/Celeron(pre-Coppermine)"
	depends on X86_32
	---help---
	Select this for Intel chips based on the Pentium-II and
	pre-Coppermine Celeron core. This option enables an unaligned
	copy optimization, compiles the kernel with optimization flags
	tailored for the chip, and applies any applicable Pentium Pro
	optimizations.

	config MPENTIUMIII
	bool "Pentium-III/Celeron(Coppermine)/Pentium-III Xeon"
	depends on X86_32
	---help---
	Select this for Intel chips based on the Pentium-III and
	Celeron-Coppermine core. This option enables use of some
	extended prefetch instructions in addition to the Pentium II
	extensions.

	config MPENTIUMM
	bool "Pentium M"
	depends on X86_32
	---help---
	Select this for Intel Pentium M (not Pentium-4 M)
	notebook chips.

	config MPENTIUM4
	bool "Pentium-4/Celeron(P4-based)/Pentium-4 M/older Xeon"
	depends on X86_32
	---help---
	Select this for Intel Pentium 4 chips. This includes the
	Pentium 4, Pentium D, P4-based Celeron and Xeon, and
	Pentium-4 M (not Pentium M) chips. This option enables compile
	flags optimized for the chip, uses the correct cache line size, and
	applies any applicable optimizations.

	CPUIDs: F[0-6][1-A] (in /proc/cpuinfo show = cpu family : 15 )

	Select this for:
	Pentiums (Pentium 4, Pentium D, Celeron, Celeron D) corename:
	-Willamette
	-Northwood
	-Mobile Pentium 4
	-Mobile Pentium 4 M
	-Extreme Edition (Gallatin)
	-Prescott
	-Prescott 2M
	-Cedar Mill
	-Presler
	-Smithfiled
	Xeons (Intel Xeon, Xeon MP, Xeon LV, Xeon MV) corename:
	-Foster
	-Prestonia
	-Gallatin
	-Nocona
	-Irwindale
	-Cranford
	-Potomac
	-Paxville
	-Dempsey


	config MK6
	bool "K6/K6-II/K6-III"
	depends on X86_32
	---help---
	Select this for an AMD K6-family processor. Enables use of
	some extended instructions, and passes appropriate optimization
	flags to GCC.

	config MK7
	bool "Athlon/Duron/K7"
	depends on X86_32
	---help---
	Select this for an AMD Athlon K7-family processor. Enables use of
	some extended instructions, and passes appropriate optimization
	flags to GCC.

	config MK8
	bool "Opteron/Athlon64/Hammer/K8"
	---help---
	Select this for an AMD Opteron or Athlon64 Hammer-family processor.
	Enables use of some extended instructions, and passes appropriate
	optimization flags to GCC.

	config MCRUSOE
	bool "Crusoe"
	depends on X86_32
	---help---
	Select this for a Transmeta Crusoe processor. Treats the processor
	like a 586 with TSC, and sets some GCC optimization flags (like a
	Pentium Pro with no alignment requirements).

	config MEFFICEON
	bool "Efficeon"
	depends on X86_32
	---help---
	Select this for a Transmeta Efficeon processor.

	config MWINCHIPC6
	bool "Winchip-C6"
	depends on X86_32
	---help---
	Select this for an IDT Winchip C6 chip. Linux and GCC
	treat this chip as a 586TSC with some extended instructions
	and alignment requirements.

	config MWINCHIP3D
	bool "Winchip-2/Winchip-2A/Winchip-3"
	depends on X86_32
	---help---
	Select this for an IDT Winchip-2, 2A or 3. Linux and GCC
	treat this chip as a 586TSC with some extended instructions
	and alignment requirements. Also enable out of order memory
	stores for this CPU, which can increase performance of some
	operations.

	config MELAN
	bool "AMD Elan"
	depends on X86_32
	---help---
	Select this for an AMD Elan processor.

	Do not use this option for K6/Athlon/Opteron processors!

	config MGEODEGX1
	bool "GeodeGX1"
	depends on X86_32
	---help---
	Select this for a Geode GX1 (Cyrix MediaGX) chip.

	config MGEODE_LX
	bool "Geode GX/LX"
	depends on X86_32
	---help---
	Select this for AMD Geode GX and LX processors.

	config MCYRIXIII
	bool "CyrixIII/VIA-C3"
	depends on X86_32
	---help---
	Select this for a Cyrix III or C3 chip. Presently Linux and GCC
	treat this chip as a generic 586. Whilst the CPU is 686 class,
	it lacks the cmov extension which gcc assumes is present when
	generating 686 code.
	Note that Nehemiah (Model 9) and above will not boot with this
	kernel due to them lacking the 3DNow! instructions used in earlier
	incarnations of the CPU.

	config MVIAC3_2
	bool "VIA C3-2 (Nehemiah)"
	depends on X86_32
	---help---
	Select this for a VIA C3 "Nehemiah". Selecting this enables usage
	of SSE and tells gcc to treat the CPU as a 686.
	Note, this kernel will not boot on older (pre model 9) C3s.

	config MVIAC7
	bool "VIA C7"
	depends on X86_32
	---help---
	Select this for a VIA C7. Selecting this uses the correct cache
	shift and tells gcc to treat the CPU as a 686.

	config MPSC
	bool "Intel P4 / older Netburst based Xeon"
	depends on X86_64
	---help---
	Optimize for Intel Pentium 4, Pentium D and older Nocona/Dempsey
	Xeon CPUs with Intel 64bit which is compatible with x86-64.
	Note that the latest Xeons (Xeon 51xx and 53xx) are not based on the
	Netburst core and shouldn't use this option. You can distinguish them
	using the cpu family field
	in /proc/cpuinfo. Family 15 is an older Xeon, Family 6 a newer one.

	config MCORE2
	bool "Core 2/newer Xeon"
	---help---

	Select this for Intel Core 2 and newer Core 2 Xeons (Xeon 51xx and
	53xx) CPUs. You can distinguish newer from older Xeons by the CPU
	family in /proc/cpuinfo. Newer ones have 6 and older ones 15
	(not a typo)

	config MATOM
	bool "Intel Atom"
	---help---

	Select this for the Intel Atom platform. Intel Atom CPUs have an
	in-order pipelining architecture and thus can benefit from
	accordingly optimized code. Use a recent GCC with specific Atom
	support in order to fully benefit from selecting this option.

	config GENERIC_CPU
	bool "Generic-x86-64"
	depends on X86_64
	---help---
	Generic x86-64 CPU.
	Run equally well on all x86-64 CPUs.

	endchoice

	config X86_GENERIC
	bool "Generic x86 support"
	depends on X86_32
	---help---
	Instead of just including optimizations for the selected
	x86 variant (e.g. PII, Crusoe or Athlon), include some more
	generic optimizations as well. This will make the kernel
	perform better on x86 CPUs other than that selected.

	This is really intended for distributors who need more
	generic optimizations.

	#
	# Define implied options from the CPU selection here
	config X86_INTERNODE_CACHE_SHIFT
	int
	default "12" if X86_VSMP
	default X86_L1_CACHE_SHIFT

	config X86_L1_CACHE_SHIFT
	int
	default "7" if MPENTIUM4 \|\| MPSC
	default "6" if MK7 \|\| MK8 \|\| MPENTIUMM \|\| MCORE2 \|\| MATOM \|\| MVIAC7 \|\| X86_GENERIC \|\| GENERIC_CPU
	default "4" if MELAN \|\| M486 \|\| MGEODEGX1
	default "5" if MWINCHIP3D \|\| MWINCHIPC6 \|\| MCRUSOE \|\| MEFFICEON \|\| MCYRIXIII \|\| MK6 \|\| MPENTIUMIII \|\| MPENTIUMII \|\| M686 \|\| M586MMX \|\| M586TSC \|\| M586 \|\| MVIAC3_2 \|\| MGEODE_LX

	config X86_PPRO_FENCE
	bool "PentiumPro memory ordering errata workaround"
	depends on M686 \|\| M586MMX \|\| M586TSC \|\| M586 \|\| M486 \|\| MGEODEGX1
	---help---
	Old PentiumPro multiprocessor systems had errata that could cause
	memory operations to violate the x86 ordering standard in rare cases.
	Enabling this option will attempt to work around some (but not all)
	occurrences of this problem, at the cost of much heavier spinlock and
	memory barrier operations.

	If unsure, say n here. Even distro kernels should think twice before
	enabling this: there are few systems, and an unlikely bug.

	config X86_F00F_BUG
	def_bool y
	depends on M586MMX \|\| M586TSC \|\| M586 \|\| M486

	config X86_INVD_BUG
	def_bool y
	depends on M486

	config X86_ALIGNMENT_16
	def_bool y
	depends on MWINCHIP3D \|\| MWINCHIPC6 \|\| MCYRIXIII \|\| MELAN \|\| MK6 \|\| M586MMX \|\| M586TSC \|\| M586 \|\| M486 \|\| MVIAC3_2 \|\| MGEODEGX1

	config X86_INTEL_USERCOPY
	def_bool y
	depends on MPENTIUM4 \|\| MPENTIUMM \|\| MPENTIUMIII \|\| MPENTIUMII \|\| M586MMX \|\| X86_GENERIC \|\| MK8 \|\| MK7 \|\| MEFFICEON \|\| MCORE2

	config X86_USE_PPRO_CHECKSUM
	def_bool y
	depends on MWINCHIP3D \|\| MWINCHIPC6 \|\| MCYRIXIII \|\| MK7 \|\| MK6 \|\| MPENTIUM4 \|\| MPENTIUMM \|\| MPENTIUMIII \|\| MPENTIUMII \|\| M686 \|\| MK8 \|\| MVIAC3_2 \|\| MVIAC7 \|\| MEFFICEON \|\| MGEODE_LX \|\| MCORE2 \|\| MATOM

	config X86_USE_3DNOW
	def_bool y
	depends on (MCYRIXIII \|\| MK7 \|\| MGEODE_LX) && !UML

	#
	# P6_NOPs are a relatively minor optimization that require a family >=
	# 6 processor, except that it is broken on certain VIA chips.
	# Furthermore, AMD chips prefer a totally different sequence of NOPs
	# (which work on all CPUs). In addition, it looks like Virtual PC
	# does not understand them.
	#
	# As a result, disallow these if we're not compiling for X86_64 (these
	# NOPs do work on all x86-64 capable chips); the list of processors in
	# the right-hand clause are the cores that benefit from this optimization.
	#
	config X86_P6_NOP
	def_bool y
	depends on X86_64
	depends on (MCORE2 \|\| MPENTIUM4 \|\| MPSC)

	config X86_TSC
	def_bool y
	depends on (MWINCHIP3D \|\| MCRUSOE \|\| MEFFICEON \|\| MCYRIXIII \|\| MK7 \|\| MK6 \|\| MPENTIUM4 \|\| MPENTIUMM \|\| MPENTIUMIII \|\| MPENTIUMII \|\| M686 \|\| M586MMX \|\| M586TSC \|\| MK8 \|\| MVIAC3_2 \|\| MVIAC7 \|\| MGEODEGX1 \|\| MGEODE_LX \|\| MCORE2 \|\| MATOM) \|\| X86_64

	config X86_CMPXCHG64
	def_bool y
	depends on X86_PAE \|\| X86_64 \|\| MCORE2 \|\| MPENTIUM4 \|\| MPENTIUMM \|\| MPENTIUMIII \|\| MPENTIUMII \|\| M686 \|\| MATOM

	# this should be set for all -march=.. options where the compiler
	# generates cmov.
	config X86_CMOV
	def_bool y
	depends on (MK8 \|\| MK7 \|\| MCORE2 \|\| MPENTIUM4 \|\| MPENTIUMM \|\| MPENTIUMIII \|\| MPENTIUMII \|\| M686 \|\| MVIAC3_2 \|\| MVIAC7 \|\| MCRUSOE \|\| MEFFICEON \|\| X86_64 \|\| MATOM \|\| MGEODE_LX)

	config X86_MINIMUM_CPU_FAMILY
	int
	default "64" if X86_64
	default "6" if X86_32 && X86_P6_NOP
	default "5" if X86_32 && X86_CMPXCHG64
	default "4"

	config X86_DEBUGCTLMSR
	def_bool y
	depends on !(MK6 \|\| MWINCHIPC6 \|\| MWINCHIP3D \|\| MCYRIXIII \|\| M586MMX \|\| M586TSC \|\| M586 \|\| M486) && !UML

	menuconfig PROCESSOR_SELECT
	bool "Supported processor vendors" if EXPERT
	---help---
	This lets you choose what x86 vendor support code your kernel
	will include.

	config CPU_SUP_INTEL
	default y
	bool "Support Intel processors" if PROCESSOR_SELECT
	---help---
	This enables detection, tunings and quirks for Intel processors

	You need this enabled if you want your kernel to run on an
	Intel CPU. Disabling this option on other types of CPUs
	makes the kernel a tiny bit smaller. Disabling it on an Intel
	CPU might render the kernel unbootable.

	If unsure, say N.

	config CPU_SUP_CYRIX_32
	default y
	bool "Support Cyrix processors" if PROCESSOR_SELECT
	depends on M486 \|\| M586 \|\| M586TSC \|\| M586MMX \|\| (EXPERT && !64BIT)
	---help---
	This enables detection, tunings and quirks for Cyrix processors

	You need this enabled if you want your kernel to run on a
	Cyrix CPU. Disabling this option on other types of CPUs
	makes the kernel a tiny bit smaller. Disabling it on a Cyrix
	CPU might render the kernel unbootable.

	If unsure, say N.

	config CPU_SUP_AMD
	default y
	bool "Support AMD processors" if PROCESSOR_SELECT
	---help---
	This enables detection, tunings and quirks for AMD processors

	You need this enabled if you want your kernel to run on an
	AMD CPU. Disabling this option on other types of CPUs
	makes the kernel a tiny bit smaller. Disabling it on an AMD
	CPU might render the kernel unbootable.

	If unsure, say N.

	config CPU_SUP_CENTAUR
	default y
	bool "Support Centaur processors" if PROCESSOR_SELECT
	---help---
	This enables detection, tunings and quirks for Centaur processors

	You need this enabled if you want your kernel to run on a
	Centaur CPU. Disabling this option on other types of CPUs
	makes the kernel a tiny bit smaller. Disabling it on a Centaur
	CPU might render the kernel unbootable.

	If unsure, say N.

	config CPU_SUP_TRANSMETA_32
	default y
	bool "Support Transmeta processors" if PROCESSOR_SELECT
	depends on !64BIT
	---help---
	This enables detection, tunings and quirks for Transmeta processors

	You need this enabled if you want your kernel to run on a
	Transmeta CPU. Disabling this option on other types of CPUs
	makes the kernel a tiny bit smaller. Disabling it on a Transmeta
	CPU might render the kernel unbootable.

	If unsure, say N.

	config CPU_SUP_UMC_32
	default y
	bool "Support UMC processors" if PROCESSOR_SELECT
	depends on M486 \|\| (EXPERT && !64BIT)
	---help---
	This enables detection, tunings and quirks for UMC processors

	You need this enabled if you want your kernel to run on a
	UMC CPU. Disabling this option on other types of CPUs
	makes the kernel a tiny bit smaller. Disabling it on a UMC
	CPU might render the kernel unbootable.

	If unsure, say N.